To prepare ganache, place the chocolate, heavy cream and corn syrup in a medium heatproof bowl over a pot of simmering water. Stir the mixture using a wooden spoon until melted and smooth, about 5 minutes.

Grab each cupcake with its bottom, dip cupcake in the ganache to coat the top, let excess drip off. Place cupcakes in refrigerator for 10 minutes to set the ganache.
Garnish with sprinkles.